Plural and Possessive clarification
For all the grammar nerds out there: Plural and Possessive clarification
The part that I forgot most often is
When a sentence indicates joint ownership in a compound construction, the possessive form is attached only to the second noun:
Deanna and Brandi’s vacation plans
Tim and Bethany’s wedding invitation
Note that individual ownership is marked by a double possessive:
Courtney’s and Mem’s grade point averages
Tim and Bethany share the same wedding invitation, whereas Courtney and Mem each have their own grade point averages.
